Used in plant biology research to quantify phenylalanine ammonia-lyase (PAL) enzyme activity, this ELISA kit enables scientists to study plant defense mechanisms, stress responses, and secondary metabolite production. It is particularly valuable in investigating how plants respond to pathogen attack, UV radiation, and environmental stressors, as PAL is a key enzyme in the phenylpropanoid pathway leading to the synthesis of lignin, flavonoids, and phytoalexins. The assay allows for high-sensitivity detection of PAL levels in plant tissue extracts, supporting research in agriculture, plant physiology, and molecular biology. Its application aids in breeding stress-resistant crops and understanding metabolic regulation in plants.